A piece 3 by 5 feet sells for $18 to $24.

Rare pieces may sell for hundreds or even thousands of dollars.

Fifteen pieces sold that week, at prices ranging from $641 to $2,180.

A triangular piece about 2 m long sold for €1,000.

These charming pieces, a glimpse of the past, sell for about $2.

"Many significant pieces of art have been sold rather than given to institutions."

It was a smart gamble: several pieces now sell for more than $200 each.

"More pieces will sell for that level than ever have before."

The state kept most of the income from whatever pieces they did sell abroad.

Made mostly by hobbyists, the pieces sell for $5 to $35 today.