ABSTRACT
David, the Constructor: One of his many constructions with solid pen tominoes is, what I call, the pentacube tower. To my knowledge, David
never published or mentioned it to his friends before 1968. Among his
many drawings, I was fortunate enough to find two different towers which
are copied in Figure 1 (Type I ) . T h e reader, if in possession of a set of
pentacubes, will certainly feel rewarded to successfully construct either
At the end of 1968, David came to Eindhoven University of Technol
ogy for the first time; his third and last visit to Eindhoven University
was in 1991. He found colleagues and friends not only in Mathematics
but also in the Building and Architecture Departments, and lectured
about combinatorial problems.
