# Life Objects Buildable With >1 Glider/Bit

Still-life |
Pseudo-still-lifes |
P2 oscillators |
P2 pseudo-oscillators |
P3 oscillators |
P3 pseudo-oscillators |
P4 oscillators |
P5 oscillators |
P5 pseudo-oscillators |
P5 oscillator |
P8 oscillators |
P10 oscillators
P10 pseudo-oscillators |
Naturally-occurring objects

Most small objects can be synthesized from a number of glider that does not
exceed the population of the object. (Of course, as the size of objects
increase, so does the possible complexity, so larger objects are more prone to
be expensive, if not impossible to synthesize.)

The few remaining overly-expensive objects are shown. Omitted are categories
where all syntheses are reasonably inexpensive. Also omitted are the
larger-population categories where syntheses have only been attempted for a
small number of objects.
(NOTE: As technology improves, objects may be removed from these lists.)

## 1 still-life up to 14 bits
costing > 1 glider/bit

Buckingham completed the
monumental task of synthesizing all objects up to 14 bits in the 1980s,
and also reduced the costs of all still-lifes
to no more than one glider per bit.
In the 1990s, he further reduced these to strictly less than one glider per
per bit (except 15 14-bit ones, of which
only 12 still remain.)

Due to a bookkeeping oversight, one
14-bit still-life
still requires one glider too many.

(NOTE: As the syntheses of the 15-bit still-lifes have not yet been
completed, they are not yet included in this list.)

## The 10 pseudo-still-lifes up to 16 bits
costing >1 glider/bit

## The 54 period 2 oscillators up to 17 bits
costing >1 glider/bit

## The 27 period 3 oscillators up to 20 bits
costing >1 glider/bit

## The 34 period 4 oscillators up to 21 bits
costing >1 glider/bit

## The 38 period 5 oscillators up to 21 bits
costing >1 glider/bit

## The 1 period 6 oscillator up to 21 bits
costing >1 glider/bit

## The 1 period 8 oscillator up to 25 bits
costing >1 glider/bit

All of these except Merzenich's P10 have a pseudo-period of 10, a composite
of 2 and 5.

These all have a pseudo-period of 10, a composite of 2 and 5.

## The top 1 naturally-occurring object
costing >1 glider/bit

**Other costs:**
2 gliders,
3 gliders,
4 gliders,
5 gliders,
6 gliders,
1 glider/bit,
>1 glider/bit,
unknown.

**See also:** Life objects sorted by:
counts,
frequency of occurrence,
cost in gliders,
name,
size in bits,
or type.

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Copyright © 1997, 1998, 1999, 2013, 2014 by Mark. D. Niemiec.
All rights reserved.

This page was last updated on
*2015-02-19*.