  We discuss solutions of the spherically symmetric wave equation and Klein
Gordon equation in an arbitrary number of spatial and temporal dimensions.
Starting from a given solution, we present various procedures to generate
futher solutions in the same or in different dimensions. The transition from
odd to even or non integer dimensions can be performed by fractional derivation
or integration. The dimensional shift, however, can also be interpreted simply
as a modification of the dynamics. We also discuss the analytic continuation to
arbitrary real powers of the D'Alembert operator. There, particular
peculiarities in the pole structure show up when $p$ and $q$ are both even.
Finally we give operators which transform a time into a space coordinate and
v.v. and comment on their possible relation to black holes. In this context, we
describe a few aspects of the extension of our discussion to a curved metrics.
